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Lithium ion battery positive plate using multi-layer coated ternary positive electrode material and preparation method of lithium ion battery positive plate

A lithium-ion battery and cathode material technology, applied in the field of lithium-ion battery cathode sheet and its preparation, can solve problems such as difficulty in maintaining the structural integrity of the electrode sheet, reducing the ionic conductivity of the cathode material, and affecting the cycle performance of the battery. Cycling performance, improving lithium ion conductivity, and improving the overall mechanical strength

Active Publication Date: 2021-09-07
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the invention of the present invention is in order to overcome the coating modification of ternary positive electrode material in the prior art, it is easy to cover inhomogeneously with inorganic material coating, and carries out coating with conducting polymer, although can improve The uniformity of coating, but the introduction of conductive polymer will reduce the ionic conductivity of the positive electrode material, which is not conducive to the improvement of electrode performance. Provide a lithium ion battery positive electrode sheet and its Preparation method, using Li 2+x C 1-x B x o 3 The ternary positive electrode material is coated with a conductive polymer in multiple layers, which ensures the uniformity of the coating and makes the coating layer have good ion conductivity, which effectively improves the performance of the battery.
[0006] The second object of the present invention is to overcome the low bonding strength of the water-based binder in the prior art, and the large loss of mechanical properties as the electrolyte is soaked at high temperature, which makes it difficult to To maintain the integrity of the pole piece structure, it is easy to cause the active material to fall off and affect the cycle performance of the battery. A lithium-ion battery positive plate using a multi-layer coated ternary positive electrode material and a preparation method thereof are provided. The water-based binder that undergoes photocrosslinking is used as the positive electrode binder, and the overall mechanical strength of the binder is improved through photocrosslinking to ensure the structural integrity of the electrode sheet during charge and discharge, thereby improving the battery cycle performance

Method used

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Embodiment 1

[0036] A method for preparing a lithium-ion battery cathode sheet using a multilayer coated ternary cathode material, comprising the steps of:

[0037] (1) Preparation of multi-layer coated ternary cathode material:

[0038] A) Mix the NCM ternary material precursor NCM811 (Ni:Co:Mn molar ratio is 8:1:1) with lithium carbonate and zirconia, and stir evenly to obtain a powder material. The molar ratio of NCM811 to lithium carbonate is 1:1.1 , the doping amount of zirconia is 1000ppm of the mass of NCM811; the powder material is calcined once, the calcining temperature is 800°C, the calcining time is 24h, and the NCM ternary material is obtained after crushing;

[0039] B) Lithium borate and lithium carbonate are uniformly mixed at a molar ratio of B atoms to C atoms of 1:1, and sintered at 850°C for 24h to obtain Li 2.5 C 0.5 B 0.5 o 3 coating agent;

[0040] C) Combining NCM ternary materials with Li 2.5 C 0.5 B 0.5 o 3 After the coating agent is mixed evenly, the sec...

Embodiment 2

[0048] A method for preparing a lithium-ion battery cathode sheet using a multilayer coated ternary cathode material, comprising the steps of:

[0049] (1) Preparation of multi-layer coated ternary cathode material:

[0050] A) NCM ternary material precursor NCM811 is mixed with lithium hydroxide and alumina, and stirred evenly to obtain a powder material, the molar ratio of NCM811 and lithium hydroxide is 1:1.0, and the doping amount of alumina is 300ppm of the mass of NCM811; The powder material is calcined once, the calcining temperature is 700°C, the calcining time is 26h, and the NCM ternary material is obtained after crushing;

[0051] B) Lithium borate and lithium carbonate are mixed evenly at a molar ratio of B atoms to C atoms of 1:4, and sintered at 800°C for 26h to obtain Li 2.2 C 0.8 B 0.2 o 3 coating agent;

[0052] C) Combining NCM ternary materials with Li 2.2 C 0.8 B 0.2 o 3 After the coating agent is mixed evenly, the secondary calcination is carried ...

Embodiment 3

[0060] A method for preparing a lithium-ion battery cathode sheet using a multilayer coated ternary cathode material, comprising the steps of:

[0061] (1) Preparation of multi-layer coated ternary cathode material:

[0062] A) NCM ternary cathode material precursor NCM811 is mixed with lithium carbonate and aluminum oxide, and stirred evenly to obtain a powder material, the mol ratio of NCM811 and lithium carbonate is 1:1.2, and the doping amount of zirconia is 2000ppm of NCM811 quality; The powder material is calcined once, the calcining temperature is 900°C, the calcining time is 18h, and the NCM ternary material is obtained after crushing;

[0063] B) Lithium borate and lithium carbonate are mixed evenly at a molar ratio of B atoms to C atoms of 2:3, and sintered at 900°C for 18h to obtain Li 2.4 C 0.6 B 0.4 o 3 coating agent;

[0064] C) Combining NCM ternary materials with Li 2.4 C 0.6 B 0.4 o 3 After the coating agent is mixed evenly, the secondary calcination ...

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Abstract

The invention discloses a lithium ion battery positive plate using a multi-layer coated ternary positive electrode material, which comprises a positive electrode current collector and a positive electrode active material layer loaded on the positive electrode current collector, wherein the positive electrode active material layer comprises the multi-layer coated ternary positive electrode material, a conductive agent, a thickening agent and a binder; the multi-layer coated ternary positive electrode material comprises an NCM ternary material, and a Li<2+x>C<1-x>BxO3 coating layer and a polyaniline coating layer which sequentially coat the surface of the NCM ternary material; and the binder is prepared from a prepolymer dispersion liquid, 1, 6-hexanedithiol and a photoinitiator. According to the invention, Li<2+x>C<1-x>BxO3 and the conductive polymer are adopted to perform multi-layer coating on the ternary positive electrode material, so that the coating layer has good ionic conductivity while the coating uniformity is ensured; and a water-based binder which can be subjected to photo-crosslinking under ultraviolet irradiation is adopted as the binder, so that the overall mechanical strength of the binder is improved through photo-crosslinking, and the structural integrity of the pole piece in the charging and discharging process is ensured.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery cathode sheet using a multi-layer coated ternary cathode material and a preparation method thereof. Background technique [0002] With the development of new energy vehicles, lithium-ion power batteries have attracted much attention as the most popular electric vehicle power batteries. As an important component in lithium-ion batteries, the research and development of high-performance positive electrodes is of great significance. [0003] At present, layered lithium cobaltate, ternary materials, spinel-structured lithium manganate and olivine-structured lithium iron phosphate are mainly used as positive electrode active materials in the positive electrode sheet of lithium-ion batteries. Ternary materials have high specific capacity, energy density and power density, and relatively stable performance, so they have become popular materials for c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/62H01M4/505H01M4/525H01M10/0525H01M4/1391
CPCH01M4/131H01M4/1391H01M4/624H01M4/628H01M4/622H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 汉海霞陈瑶许梦清
Owner WANXIANG 123 CO LTD
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